mirror of https://github.com/nmlgc/ReC98.git
25 lines
901 B
C++
25 lines
901 B
C++
// [scroll_line] is advanced by 1 for every 16 units.
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extern SubpixelLength8 scroll_subpixel_line;
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// Amount to add to [scroll_subpixel_line] every frame.
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extern SubpixelLength8 scroll_speed;
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// Current line at the top of VRAM.
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extern int scroll_line;
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extern int scroll_line_on_page[2];
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// Playfield-space pixels scrolled in the last frame.
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extern Subpixel scroll_last_delta;
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// If false, the game doesn't draw stage tiles, assuming that someone else
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// draws the background.
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extern bool scroll_active;
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// Transforms [y] to its corresponding VRAM line, adding the current
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// [scroll_line] or 0 if scrolling is disabled.
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int pascal near scroll_subpixel_y_to_vram_seg1(subpixel_t y);
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int pascal near scroll_subpixel_y_to_vram_seg3(subpixel_t y);
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// Like the one above, but always adds [scroll_line], even if scrolling is
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// disabled.
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int pascal near scroll_subpixel_y_to_vram_always(subpixel_t y);
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